In cockroach, the anterior end of heart opens into

Options

A. Pericardial sinus
B. Perivisceral sinus
C. Perineural sinus
D. Head sinus

Answer

To solve the question "In cockroach, the anterior end of heart opens into," we need to understand the circulatory system of the cockroach and the structure of its heart.

### Step-by-Step Solution:

1. **Understanding the Heart Structure in Cockroach**:
- The heart of a cockroach is a tubular structure that is located dorsally (on the back side) in the thorax and abdomen. It is responsible for pumping hemolymph (the insect equivalent of blood) throughout the body.

2. **Identifying the Sinuses**:
- In the circulatory system of cockroaches, there are several sinuses where hemolymph flows. The main sinuses include:
- Head sinus
- Perineural sinus
- Perivisceral sinus (also known as hemocele)
- Pericardial sinus

3. **Locating the Anterior End of the Heart**:
- The anterior end of the heart is the front part of the heart, which is directed towards the head of the cockroach.

4. **Determining Where the Anterior End Opens**:
- The anterior end of the heart opens into the head sinus. This is the first chamber that receives hemolymph pumped from the heart.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the anterior end of the heart in a cockroach opens into the **head sinus**.

### Final Answer:
The anterior end of the heart in a cockroach opens into the **head sinus**.